<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item',item.id==0?'mui-active':'']" v-for="item in cats" :key="item.id" @tap="getPhotolistByCateId(item.id)">
							{{item.title}}
						</a>						
					</div>
				</div>
		</div>

        <!-- 图片列表区域 -->
        <ul class="photo-list">
            <router-link :to="'/home/photoinfo/'+item.id" v-for="item in list" :key="item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info">
                    <h1 class="info-title">{{item.title}}</h1>
                    <div class="info-body">{{item.zhaiyao}}</div>
                </div>
            </router-link>
        </ul>
    </div>
</template>

<script>
//1.导入mui的JS文件
import mui from '../../mui/js/mui.js'
export default {
    data () {
        return {
            cats:[],//所有分类的列表数组
            list:[]//图片列表的数组
        }
    },
    created () {       
        this.getAllCategory();
        //默认进入页面就主动请求所有图片列表的数据
        this.getPhotolistByCateId(0) 
    },
    mounted () {
      //当组件中的DOM结构渲染好并放到页面中后会执行这个钩子函数
      //如果要操作元素了，最好在mounted里面，因为这里时候的DOM元素是最新的
      //2.初始化滑动控件
        mui('.mui-scroll-wrapper').scroll({
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        });
    },    
    methods: {
        getAllCategory(){
            //获取所有的图片分类
            this.$http.get('api/getimgcategory').then(result=>{
                if(result.body.status==0){
                    //手动拼接出一个最完整的分类列表
                    result.body.message.unshift({title:'全部',id:0})
                    this.cats=result.body.message
                }
            })
        },
        getPhotolistByCateId(cateid){
            //根据分类Id获取图片列表
            this.$http.get('api/getimages/'+cateid).then(result=>{
                if(result.body.status==0){
                    this.list=result.body.message
                }
            })
        }
    },
}
</script>

<style lang="scss" scoped>    
    .photo-list{
        list-style: none;
        margin: 0px;
        padding: 10px;
        padding-bottom: 0px;
        box-shadow: 0 0 6px #999;
        li{
            background-color: #ccc;
            text-align: center;     
            margin-bottom: 10px;      
            position: relative; 
            img{
                width: 100%;     
                vertical-align: middle;        
            }
            img[lazy=loading] {
                width: 40px;
                height: 300px;
                margin: auto;
            }
            .info{
                color: white;
                text-align: left;
                position: absolute;
                bottom: 0px;
                background-color: rgba(0,0,0,0.4);
                max-height: 84px;
                .info-title{
                    font-size: 14px;
                }
                .info-body{
                    font-size: 13px;
                }
            }
        }       
    }
</style>